<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        /* body{
            background-color: aquamarine;
        } */
        .father .one{
            /* background-color: blue;
             */
            height: 700px;
            width: 500px;
            background-image: url(./p21.jpg);
            background-repeat: no-repeat;
            background-position: center;
            background-size: contain;
        }
        /* .father .two{
            background-color: rgb(0, 255, 42);
        }
        .father .three{
            background-color: rgb(255, 0, 0);
        } */
    </style>
</head>
<body>  
    <div class="father">
         <div class="one"></div>
         <!-- <div class="two">world</div>
         <div class="three">hello world</div> -->
    </div>
</body>
</html>